Chemistry
In the laboratory you will be provided with a 1.0 x 10-5 M primary stock solution of fluorescein (MW=332.31g/mol). The calibration curve should include a blank, 0.025, 0.05, 0.075, 0.10, 0.15, and 0.25 micromolar fluorescein solutions. Since you will be using 25 mL volumetric ...October 19, 2016

english
Narguess, in My Forbidden face, starts a rebellion among the women. What kept the guards from killing her? A)Her brother testified in her defense. B) The company vouched for her helping build profits. C) The other women took off their chadri and refused to leave D) The ...September 16, 2016

English
Which of the following is an example of a run-on sentence? Baseball is an amazing sport to play and to watch. Nothing beats the thrill of the sport on the diamond. I hope you like watching baseball, I really love it. If you dont watch it, you dont know what you...October 13, 2015

Chemistry
Argon makes up 0.93% by volume of air. Calculate its solubility in water a 20 C and 1.0 atm. The henry's law constant for argon under these conditions is 0.0015 mol/L*atmDecember 8, 2014

English
Thanks for the help! For 3, is it advice, for the state of advising? I think that 4 does not need the comma, but the wording of the question confused me for 5. 5 does not need any MORE commas, but it needs the commas it has :/ I think the question could have ben worded better...April 18, 2013

English
Please check my answers! Thanks :) 1. In Yeatss poem The Second Coming, the falcon and the falconer are images that most likely represent *something out of control and unnatural. the beauty and abundance of nature. a sad, uncomfortable image of old age. 2. ...April 18, 2013

chemistry
Based on the following reaction 2A + 3B --> A2B3, if 1 mole of A is reacted with 2 moles of B, explain how you would determine which of the two substances is the limiting reactant.March 19, 2013

Chemistry
Simple problem and I think this guy is over thinking it. It's an intro to Chem class. Anyway you have initial temp/initial volume. Unknown secondary temp/known secondary volume. Charle's law is V1/T1 = V2/T2. I'm sure you can figure it out from here...March 16, 2013

Physics
How far apart must two protons be if the magnitude of the electrostatic force acting on either one due to the other is equal to the magnitude of the gravitaional force on a proton at the earth's surface?November 17, 2012

Physics
A ball of mass 0.1 kg is suspended vertically from the ceiling with a "massless" string and brought to rest. The string is one meter long. When a force of 0.5N is applied 45 deg. below the horizontal, what will be the magnitude of the resulting angular acceleration ...November 4, 2012

physics
for an 84 kg person standing at the equator what is the magnitude of angular momentum about the earths center due to earth's rotationOctober 31, 2012

physics
Use energy methods to find the speed of a 2.0-kg block just before it hits the flor if the coefficent of kinetic energy of the 3.0-kg block and the table is 0.15mOctober 30, 2012

Physics
A 63 kg student is standing atop a spring in an elevator that is accelerating upward at 2.5 m/s^2 . The spring constant is 2700 N/m. By how much is the spring compressed?October 11, 2012

Physics
A 60kg skier starts from rest at a height of 20m above the end of a ski-jump and leaves the ramp at an angle of 28 degrees. Neglet air resistance and assume the ramp is frictionless. A) What is the max height (h) of his jump above the end of the ramp B)If he increased his ...October 11, 2012

Math
You need to lay communications cable around the perimeter of three offices, each 8' by 10'. How much cable do you need?July 10, 2012

Math
a baseball measures 2 11/16 inches in diameter. What is its volume ( to the nearest hundredth )June 14, 2012

geometry
bulletin board border please help me. i would like to make a geometry bulletin board that has a a border of circles, triangles and squares. i know that 20 shapes will fit across the board and that 12 shapes will fit down the board . if i start in the top left hand corner with ...January 15, 2012

statistics
Kim and Susan are playing a tennis match where the winner must win 2 sets in order to win the match. For each set, the probability that Kim wins the set is 0.53. The probability of Kim winning the set is not affected by who has won any previous sets. What is the expected value...March 22, 2011

science
Hi. I am conducting a science experiment to present to a class. Details of experiment below. Materials: 1 can of non-diet soda 1 can of diet soda 2 buckets of water 1. Fill bucket 2. Put can of non-diet soda into a bucket of water. 3. Wait for the can to either sink or float. ...November 28, 2010

physics
On Earth a rock falls an unknown vertical distance from a resting position and lands in a lake. If it takes the rock 2.5 seconds to fall, how high is the cliff that the rock fell from?October 28, 2010

Chemistry
the total pressure in the vessel is 199kPa. How much pressure does nitrogen exert on helium if it had a pressure of 94 kPa?October 19, 2010

calculus
"How fast is the area of the triangle formed by the ladder, the house, and the ground when the base of the ladder is 7 ft. away from the wall? Given h=24ft. dh/dt=-7/12ft. per sec. b=7 (base) db/dt=2ft. per sec. d/dt[A=1/2bh] How would you derive this with respect to time?October 14, 2010

Pre algebra
A store was offering 30 % off everything in the bike store . A boy bought a bike for $91 dollars. How much was the original price of the bike? please explain each step. We are studying proportions and percents. thanksJune 22, 2010

Finance
What would be the fee for a buyer to purchase 2 discount points on a home with a sale price of $275,000?May 14, 2010

Finance
If the APR on your credit is 18%, what percentage do you pay each month on an outstanding balance?May 14, 2010

com 220
What strategies do you use for revising a paper? How do you know when to accept feedback from another source? What makes feedback valuable to you?September 8, 2009

7th math
take 23 divide it by 4 and it is 5.75 to make a percent you move your decimal two places 575% couldn't understand second problem could you rewriteSeptember 8, 2009

college Chemistry
Write a balanced equation for the dissolution of sodium carbonate (Na2CO3) in water. Find the number of moles of Na+ produced when 0.318 mol of sodium carbonate dissolves. Answer in units of mol.January 24, 2009

Stat
In statistic regressions, does "standard error" mean the residual (vertical distance of each point from the regression line)?November 16, 2008

chemistry
given this reaction N2O5 -> 2 N2O + 1/2 O2 all gases and given the initial pressure (P Initial) and total pressure (P total)at any time, relate the partial pressure of N2O5 (PP N2O5) to P total for any time during this reaction. Consider gas kinetics. My teacher says the ...July 7, 2008